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Effect of Particle Size of Platinum and Platinum-Cobalt Catalysts on Stability Against Load Cycling
To investigate the effect of load cycling, platinum (Pt) and platinum-cobalt (PtCo) fuel cell catalysts with different particle sizes were prepared and evaluated for their durability against load cycling. The particle size of the Pt and PtCo catalysts was controlled by changing
the catalyst loading and by applying heat treatment. Pt catalysts with particle sizes of 2‐3 nm and 4‐5 nm and PtCo catalysts with sizes of 3‐4 nm, 4‐5 nm and 7‐8 nm were obtained. A potential sweep from 0.65 V to 1.05 V was applied to the cathode of membrane
electrode assemblies (MEAs) prepared with these catalysts,and the degradation of their mass activity and cell voltage were evaluated. As a result of this investigation, it was found that Pt catalysts with particle sizes of 4‐5 nm and PtCo catalysts of particle sizes 7‐8 nm showed
better stability against potential sweep, with the Pt catalysts of sizes 4‐5 nm showing the best stability of all the catalysts tested.
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Document Type: Research Article
Publication date: October 1, 2010
Johnson Matthey's journal of research on the platinum group metals and developments in their application in industry from 1957-2014. It has now been renamed the Johnson Matthey Technology Review
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